    ORG 0000H
    LJMP MAIN
    ORG 0100H
MAIN:
    MOV SP,#60H
    MOV R0,#85H
    MOV R1,#04H

    MOV A,R0
    CPL A
    INC A
    ORL A,#80H
    MOV R0,A

    MOV A,R1
    CPL A
    INC A
    ANL A,#7FH

    ADD A,R0
    CPL A
    INC A
    ORL A,#80H

    END


